CVE-2026-16155 SourceCodester CVE debrief

Who should care

Users of SourceCodester Class and Exam Timetabling System 1.0 should apply patches or mitigations to prevent cross-site scripting attacks. The vulnerability can be exploited remotely, and the exploit is publicly available. Defenders should review the system for exposure and apply patches or updates as needed. Additionally, defenders should implement input validation and sanitization for user input and use a web application firewall to detect and prevent attacks.

Technical summary

The vulnerability exists in the /schoolyr.php file of SourceCodester Class and Exam Timetabling System 1.0. The sy argument is vulnerable to cross-site scripting attacks. An attacker can remotely initiate the attack by manipulating the sy argument. The exploit is publicly available, which may increase the risk of attacks. However, the CVSS score of 2 indicates a relatively low severity. Users of the system should apply patches or mitigations to prevent cross-site scripting attacks. Defenders should review the system for exposure and apply patches or updates as needed. Additionally, defenders should implement input validation and sanitization for user input and use a web application firewall to detect and prevent attacks. The CVE record was published on 2026-07-18T21:17:03.507Z and has not been modified since then. The NVD entry is currently Received. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the vendor.

Defensive priority

Low priority due to CVSS score of 2 and lack of detailed information. However, defenders should still take precautions to prevent cross-site scripting attacks.

Recommended defensive actions

• Apply patches or updates provided by the vendor
• Implement input validation and sanitization for user input
• Use a web application firewall to detect and prevent attacks
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-18T21:17:03.507Z and has not been modified since then. The NVD entry is currently Received. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the vendor. The exploit is publicly available, which may increase the risk of attacks. However, the CVSS score of 2 indicates a relatively low severity.

Official resources